Likeness isn't perfect but these are very human features. To me he looks very much like a french actor, Jean-Yves Gautier : http://www.allocine.fr/personne/fichepersonne-13508/photos-series/detail/?cmediafile=18860475

judging by the references it definitely seems like these are referenced and not traced, but with such a degree of similarity it would be informative to link to the karloff photos in the description.

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